Is CVE-2025-21043 being actively exploited?

Yes. CVE-2025-21043 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on October 2, 2025.

What is the CVSS score for CVE-2025-21043?

CVE-2025-21043 has a CVSS 3.1 base score of 8.8 (HIGH).

CVE-2025-21043

HIGH · CVSS 8.8CISA KEV: actively exploitedEPSS 2.1%EU EUVD: exploited

Out-of-bounds write in libimagecodec.quram.so prior to SMR Sep-2025 Release 1 allows remote attackers to execute arbitrary code.

Key facts

CVSS score: 8.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
EPSS score: 2.1% (82th percentile)
In CISA KEV: Yes, added October 2, 2025
In EU EUVD: Yes (EUVD-2025-29028)
Published: September 12, 2025
NVD last modified: October 8, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Samsung Mobile Devices Out-of-Bounds Write Vulnerability

Added to the KEV catalog on October 2, 2025; federal remediation due October 23, 2025.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2025-29028 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 7, 2026.

View on the EU Vulnerability Database

Affected products

samsung / android
samsung / android
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samsung / android

and 55 more…

Certified products that may be affected

8 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Samsung BoringCrypto Android 15 - Samsung Electronics Co., Ltd. - FIPS 140 5530 - active
Samsung BoringCrypto Android 14 - Samsung Electronics Co., Ltd. - FIPS 140 5521 - active
Samsung Electronics Co., Ltd. Samsung Galaxy Devices on Android 16 – Fall - Samsung Electronics Co., Ltd. - Common Criteria CCEVS-VR-VID-11664-2026 - active
Samsung Electronics Co., Ltd. Samsung Galaxy Devices on Android 15 – Spring - Samsung Electronics Co., Ltd. - Common Criteria CCEVS-VR-VID-11593-2025 - active
Samsung Galaxy Devices on Android 14 - Fall - Samsung Electronics Co., Ltd. - Common Criteria CCEVS-VR-VID-11539-2024 - active

See all 8 in the Security Certifications Explorer.

References

https://security.samsungmobile.com/securityUpdate.smsb?year=2025&month=09(Vendor Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21043(US Government Resource)

Last updated October 10, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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